| Summary: | 碩士 === 亞東技術學院 === 資訊與通訊工程研究所 === 104 === This paper is Study of Core Components for Doppler Radar with Small or Long Distance Targets, this paper mainly divided two parts with radar and antenna. Most of detecting moving targets will use doppler radar, transmit electromagnetic waves to long distant targets, when electromagnetic waves contact to the moving target, this electromagnetic waves will be reflected back to the doppler radar system, use of spectrum analysis techniques to analyze the reflected signal transformation between the frequency and phase, to detect and determine the speed of moving objects.
The core components of the radar system includes a transmitter, receiver, oscillator, mixer, DSP system, this paper focuses on the local oscillator for research and discussion. In order to detect long distance targets need to improve the antenna gain, high-gain antenna can detect long distant target, this paper will design of reflector antennas and feed horn, feed horn be design to rectangular waveguide converted to circular waveguide. In the conversion process, the TE10 mode converted to TE11 mode, in order to overcome the instability of field, the feed horn designed be changed to corrugated feed horn, reduction of electric interference.
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